ubuntu修改时区和时间的方法

改时区参考

http://blog.sina.com.cn/s/blog_6c9d65a1010145st.html

1.首先查看时区：

swfsadmin@swfsubuntu:~$ date -R
Tue,  Dec  :: +

如果要修改时区，执行sudo tzselect

2.选择区域：亚洲

swfsadmin@swfsubuntu:~$ sudo tzselect
[sudo] password for swfsadmin:
Sorry, try again.
[sudo] password for swfsadmin:
Please identify a location so that time zone rules can be set correctly.
Please select a continent or ocean.
 ) Africa
 ) Americas
 ) Antarctica
 ) Arctic Ocean
 ) Asia
 ) Atlantic Ocean
 ) Australia
 ) Europe
 ) Indian Ocean
) Pacific Ocean
) none - I want to specify the time zone using the Posix TZ format.
#? 

3.选择国家：中国

Please select a country.
 ) Afghanistan           ) Israel                ) Palestine
 ) Armenia               ) Japan                 ) Philippines
 ) Azerbaijan            ) Jordan                ) Qatar
 ) Bahrain               ) Kazakhstan            ) Russia
 ) Bangladesh            ) Korea (North)         ) Saudi Arabia
 ) Bhutan                ) Korea (South)         ) Singapore
 ) Brunei                ) Kuwait                ) Sri Lanka
 ) Cambodia              ) Kyrgyzstan            ) Syria
 ) China                 ) Laos                  ) Taiwan
) Cyprus                ) Lebanon               ) Tajikistan
) East Timor            ) Macau                 ) Thailand
) Georgia               ) Malaysia              ) Turkmenistan
) Hong Kong             ) Mongolia              ) United Arab Emirates
) India                 ) Myanmar (Burma)       ) Uzbekistan
) Indonesia             ) Nepal                 ) Vietnam
) Iran                  ) Oman                  ) Yemen
) Iraq                  ) Pakistan
#? 

4.选择时区：北京时间

Please select one of the following time zone regions.
) east China - Beijing, Guangdong, Shanghai, etc.
) Heilongjiang (except Mohe), Jilin
) central China - Sichuan, Yunnan, Guangxi, Shaanxi, Guizhou, etc.
) most of Tibet & Xinjiang
) west Tibet & Xinjiang
#? 

5.确认验证：

The following information has been given:

        China
        east China - Beijing, Guangdong, Shanghai, etc.

Therefore TZ='Asia/Shanghai' will be used.
Local time is now:      Tue Dec  :: CST .
Universal Time is now:  Tue Dec  :: UTC .
Is the above information OK?
) Yes
) No
#? 

You can make this change permanent for yourself by appending the line
        TZ='Asia/Shanghai'; export TZ
to the file '.profile' in your home directory; then log out and log in again.

Here is that TZ value again, this time on standard output so that you
can use the /usr/bin/tzselect command in shell scripts:
Asia/Shanghai

6.复制文件到/etc目录下

sudo cp /usr/share/zoneinfo/Asia/Shanghai  /etc/localtime

7.更新时间

sudo ntpdate time.windows.com

改时间参考：

http://5154091.blog.hexun.com/30735220_d.html

修改时间

sudo date -s MM/DD/YY //修改日期
sudo date -s hh:mm:ss //修改时间

在修改时间以后，修改硬件CMOS的时间

sudo hwclock --systohc //非常重要，如果没有这一步的话，后面时间还是不准

http://www.cnblogs.com/php5/archive/2011/02/15/1955432.html

http://os.51cto.com/art/200908/142234.htm